Incandescent projecting lamp



Nov. 16 1926. 1,607,515

H. L. DUNCAN INCANDESCENT PROJECTING LAMP Filed June 50. 1921 Patented Nov. 16, 1926.

I A 1,607,515 PATENT OFFICE.

UNITED STATES HARRY L. DUNCAN, OF RIDGEWOOD, NEW JERSEY.

INGANDESCENT PRO-T ECTIN G LAMP.

7 Application filed June 30,

illuminating portion of the incandescent strip so that a more definite and uniformly heated incandescent radiating surface is thus secured. g

In the accompanying illustrative somewhat diagrammatic drawing,

Fig. 1 is a vertical section.

Fig. 2 is an enlarged vertical section through the filament and diaphragm.

Fig. 3 is a rear View thereof.

Fig. 4 is an enlarged section through a modified filament and diaphragm arrangement.

Fig. 5 is a rear view thereof; and

Fig. 6 is an enlarged section through still another arrangement.

The lamp may comprise the substantially spherical bulb or lamp body 78 of regular or special glass formed with the neck 19, within which the glass or other sup ort 20 is mounted so as to support the lea wires or other supports 12, 14 which may be fused into the closed end 21 as indicated in Fig. 1. This lamp bulb is preferably filled with nitrogen or other suitable inert gas under the desired pressure, so that the incandescent metallic filament or incandescent body can be operated at high temperature and 'efliciency.

As is shown in greater detail in Figs. 2 and 3 the incandescent body or surface which is preferably substantially flat, may be formed of one or more strips or thin sheets of tungsten or other relatively infusible metal or material such as is used for incandescent lamp filaments, so as to form a substantially flat incandescent illuminating surface which may be three eighths of an inch wide more or less and located in any suitable or desired part of the bulb. In the arrangement shown in Fig. 3 the strip of 1921. Serial 11.. 431,449.

such thickness as to give the desired resist ance and other conditions, maybe formed with a transverse fold 2 within which may be located or arranged a tensioningstirrup '3 which may properties under working have a neck and connected. eye 4 projecting through an opening in the folded strip. '1 In this way the two ends 1 and 3 of the strip may form a.,substantia-lly U-shaped incandescent body and preferably have their adacent edges somewhat overlapping as indi-.

cated in Fig. 3, sotha t a substantially'com.

tinuous'incandescent surface is presented in the direction inwhich the projecting beam of light is transmitted. These strip" ends may be connected in any suitable way to lead wires such as 12, 14 which may adjacent portions to form connecting or suportmg stirrups to which the stri ends may e united or connected in any suitable way.'.

have their ends 7, 9 tw1sted or locked around the flange orportion 15 of the shield around which the wires may be bent sufliciently to give firm or substantially rigid connection therewith, and of course these lead wires which may be of tungsten or other suitable material are as not to un esirably soften or bend under the working currents used. A similar connecting flange or portion 16 on the diagreferably sufliciently heavy'so v phragm shield may support the tensioning wires 18, which may have a ring'or aligning portion engaging the eye 4 of the stirrup; and the ends 17, 22 of these wires may be brought around through holes in this flange, and bent or secured so as to preventloosening or withdrawal.

The diaphragm shield devices, which are preferably formed with a restricted transmitting aperture adjacent the incandescent illuminating surface and substantially parallel thereto, may be formed of any suitable refractory or relatively infusible material such for instance, as porcelain, pottery or the like which is preferably so constructed and spaced with relation to the incandescent filament as not to become undesirably heated or incandescent, so that the projected light is substantially limited to the beam issuing through the transmission aperture 8in the diaphragm. For'these reasonsa generally circular or conical shape may be given to or sandblasting or by this aperture, and in some cases the radiating ribs 30 may be formed on this adjacent side of the diaphragm so as to project bc-- yond the edge as shown in Fig. 3 and 5:- mote the radiation of any transmitted t and keep the diaphragm temperature down suliiciently. For this purpose the outer edge of the diaphragm may be somewhat thicker in many cases, and it is also advantageous to cut down light reflection from the outer side of the diaphragm by giving this surface 28 a ridged roughened or matt dark surface or finish as by rough grinding partially fusing or uniting roughened particles thereto, either before or after this vitreous or diaphragm is baked or formed.

Figs. 4 and 5 show another illustrative arrangement in which the incandescent body 31 may consist of a single thin strip or sheet of tungsten or other suitable high fusing metal. The ends of this strip, which may be a quarter to a half of an inch wide more or less, may be bent around and secured or united to the middle portions 32, 34 of the U-shapedlead-wires 42, 44, which may be carried upthrough the neck of the bulb or lamp body in any suitable well known manner. The diaphragm shield 36 which may have a somewhat roughened or darkened exposed surface 37, may have the restricted transmitting aperture 38 smaller than and preferably substantially parallel to the incandescent illuminating surface 31, and this diaphragm may be supported in connection with the illuminating surface in any suitable way as by the connector wires 45, 48 hooked or looped around the lead wires and having bent ends such as 46 arranged in apertures 47 in the diaphragm. When these connector wires are made of resilient tungsten or the like, the diaphragm is securely supported in the desired position and a substantial tensioning action may be exerted on the incandescent strip or filament if desired,

Fig. 6 shows another illustrative arrangement in which similar lead wires such as 44 have their U-shape'd or bent portions 32,

' 34 connected to the ends-of the incandescent filament strip 31. The pottery or other refractory diaphragm 56 may be similarly suprted as by the connector wires 45, so that as shown its aperture 52 mayin some cases be still closer to the incandescent illuminating surface; and the diaphragm may be of double conical form at this point, havin the conical surfaces 53, 57 while the more flatly conical surface 54 makes the outer edge 55 of, the diaphragm somewhat thicker. In this and the other illustrated constructions, the diaphragm shield structure may be composite and may comprise a secondary diaphragm such as 59 of tungsten or other refractory metal or material, which may preferably have its transmitting aperture 60 of somewhat smaller diameter than the primary diaphragm shield and spaced away thereradiation 0 the incandescent surface can re- 1 flect and otherwise dissipate the heat fast enough so as toprevent its becoming undesirably hot or luminous. These diaphragm shield devices thus definitely localize or restrict the actively transmitting portions of the incandescent surface to parts that are substantially uniformly heated in producing the projecting beam of light; and in this way a more definitely localized andreliablc illuminating surface can be secured than by coiled or similarly concentrated filamentarrangements, and are 'light conditions are thus more nearly approached while at the same time focusing difliculties usual with are lights are avoided.

This invention has been disclosed in connection with a number of illustrative embodiments, forms, proportions, elements. parts, shapes, materials,- compositions,- conditions, and methods of preparation, production and use, to the details of which disclosure the invention is not of course to be limited, since what is claimed as'new and what is desired to be secured by Letters Patent is set forth in the appended claims.

What I claim is 1. In incandescent projecting lamps, an in candescent body comprising a thin flat strip of tungsten bent to form asubstantially U- shaped conductor in substantially the same plane, and having the adjacent edges of the strip somewhat overlapping, lead wires connected to the ends of said strip and a wire.

tensioning device and connected stirrup arranged in the folded end of the strip 0 i posite the lead wires, a nitrogen filled bull) in whiz-h said incandescent body is supported and a diaphragm shield supported in conncction with said incandescent body and having adjacent and substantially parallel to the substantially flat surface of said incandescent body an aperture through which the useful illumination is transmitted, the outer surface of said diaphragm being rough to minimize light reflection there-from.

2. In incandescent projecting lamps, an incandescent body comprising. a thin flat strip of tungsten bent to form a substantially U- shaped conductor inisubstantially the same plane, lead wires connected to the ends of said strip and a tensioning device connected to the folded end of the strip opposite the all lead wires, a nitrogen filled bulb in which said incandescent body is supported and a diaphragm shield supported in connection with said incandescent body and having adjacent the substantially flat surface of said incandescent body an aperture through which the useful illumination is transmitted.

3. In incandescent lamps, an incandescent body comprising a flat strip of high fusing metal having adjacent portions in substantially the same plane, and having the adjacent strip edges somewhat overlapping, lead wires connected to said strip, a bulb in which said incandescent body is supported and a diaphragm shield supported in connection wlth said incandescent body and having adjacent the substantially flat surface of said incandescent body an aperture smaller than said incandescent body through which the useful illumination is transmitted.

4. In incandescent lamps, an incandescent body comprising a flat strip of high fusing metal having adjacent portions in substantially the same plane, lead wires connected to said strip, a bulb in which said incan descent body is supported and a diaphragm shield having adjacent the substantially flat surface of said incandescent body an aperture smaller than said incandescent body through which the useful illumination is transmitted. 4

5. In incandescent projecting lamps, an incandescent body comprising a substantially flat surface of high fusing metal strip, connected lead wires, a bulb in which said incandescent body is supported and a plurality of separated diaphragm shields suported in connection with and adjacent said mcandescent body and having a light trans mitting aperture smaller than said incandescent body and substantially parallel thereto.

6. In incandescent projecting lamps, an incandescent body, a bulb in which said incandescent body is supported and a plurality of separated diaphragm shields suported in connection with and adjacent said incandescent body and having a light transmitting aperture smaller than said incandescent body.

7. In incandescent projecting lamps, an incandescent body comprising a substantially flat surface of tungsten strip, connected lead wires and tensioning devices, a lamp body in which said incandescent body is supported and a diaphragm shield having heat radiating projections and supported in connection with and adjacent said incandescent body and having a light transmitting aperture substantially parallel thereto,-the outer surface of said diaphragm being darkened and roughened to minimize lightreflection.

8. In incandescent projecting lamps, an incandescent body comprising a substantial- 1y fiat surface of tungsten strip, connected lead! wires, a lamp body in which said incandescent body is supported and a dia phragm sheild having heat radiating pro- 'ections andv supported adjacent said incandescent body and having a light trans mitting aperture.

9. In incandescent lamps, an incandescent body comprising a substantially continuous flat surface of high fusing metal strip, connected lead wires,a lamp body in which said incandescent body is supported and a diaphragm shield supported within said lamp body adjacent said incandescent body and having a substantially circular light transmitting aperture relatively smaller than said incandescent body and substantially parallel thereto.

10. In incandescent lamps, an incandescent bod comprising a high fusing metal,

connecte lead wires, a lamp body in which saidincandescent body is supported and a diaphragm shield sup orted adjacent said incandescent body and having a substantially circular light transmitting aperture relatively smaller than said incandescent body.

11. In incandescent projecting lamps, an incandescent body comprising a transmitting portion which appears substantially continuous when viewed from the direction of the useful light beam, a bulb in which said incandescent body is supported and a diaphragm shield supported 1n connection with and adjacent said incandescent body and having a light transmitting a erturc smaller than said incandescent bo y and substantially parallel thereto.

12. In incandescent lamps, an incandescent body, a sealed bulb in which said incandescent body is supported and a diaphragm supported in connection with and adjacent said ncandescent body and having a light transmitting aperture relatively smaller than said incandescent body.

13. In incandescent electric lamps, an incandescent body comprising a substantially continuous flat surface of high fusing metal, connected lead wires, a sealed lamp bulb in which said incandescent body is excentrically supported and a diaphragm shield supported adjacent said incandescent body and aving a light transmitting aperture relatively smaller than said incandescent body.

14. In cncandescent electric lamps, a metallic incande2cent body, a sealed lamp bulb in which said incandescent body is supported.

and a diaphragm supported adjacent said incandescent body and having a light transmitting aperture relatively smaller than said incan escent body.

15. In incandescent projecting lamps, an incandescent body comprising a thin flat strip of tungsten bent to form a substantial- 1y U-shaped conductor in substantially the wires connected to the ends of said stri and a wire tensiomng device and (.OIUIBClQt stirrup arranged in the folded end of the strip opposite the lead wires.

16. In incandescent projecting lamps, an incandescent body comprising a thin flat strip of high fusing metal bent to form a substantially U-shaped conductor in which the substantially flat strip forming the adjacent arms of the u shaped conductor ar in substantially the same plane as theplane of the U, lead n'ircs connected to the ends of said strip and a tcnsioning device connected to the bent end of the strip opposite the lead wires. I

17. Inincandescent projecting lamps; an incandescent body comprising reflexly bent thin flat strip of high fusing metal bent to form adjacent conducting arms in which the fiat strip is arranged with slightly overlapping edges when viewed in the projecting direction and is arranged in substantially the same plane as the strip arms, lead Wires and tensioning means to hold said strip arms substantially in their extended position and maintain a substantially continuous incandescent surface in the projecting direction.

HARRY L. DUNCAN. 

